Compasses.



J. LIAGOVINO.

UOMPASSES. APPLICATION FILED AUG.8, 1911.'

I awue/wboz JOH/VJ. MCUW/VO I Emma,

J. J. IACOVINO.

GOMPASSES.

APPLIGATION FILED AUG. 8, 1911.

Patented May 13, 1913.

2 SHEETS-SHEET 2.

JOHN J. IACOVINO, 0F PROVIDENCE, RHODE ISLAND.

c oMrAssEs.

Specification of Letters Patent.

Patented May 13, 1913.

Application filed. August 8, 1911. Serial No. 642,960.

To all whom, it may concern:

Be it known that JOHN IAoovrNo, Italian subject of the King of Italy, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Compasses, of which the following is a specification.

This invention relates to drafting compasses, and has particular reference to a device of this character which may be'used as the ordinary compass, or adjusted in the manner of a bent compass so that irregular figures may be drawn.

The principal object of the invention is to so form the device that when adjusted to use for drawing ovals, ellipses or the like the pencil carrying arm will automatically move in and out according to the contour of the templet.

Another object is to so form the compass that the parts may be secured in rigid position and be used in the same manner as an ordinary compass.

These and other objects will be apparent from the following description and with reference to the accompanying drawings.

In the drawings: Figure 1 is a side elevation of the compass adjusted to be used as an ordinary compass. Fig. 2 is a vertical section of the same. Fig. 3 is a side elevation of the device when used for drawing ellipses, ovals, etc. Fig. 4 is a sectional view of the same. Fig. 5 is a horizontal sectional view on the line 55 of Fig. 1.

Referring particularly to the drawings, 10 represents the main leg of the compass, which is a straight bar having a pointed lower end. Slidably mounted on the leg is a sleeve 12, held in its different adjusted positions by means of the set screw 13, which passes through the movable leg later to be described. The sleeve 12 has a lower flange 14:, and has its upper end threaded to receive thereon a nut 15; A transverse member 16 having a vertical opening 17 therein is. adapted'to receive the sleeve 12, and rest on the flange 14:, while the nut 15 is screwed on to the sleeve, thus holding the member 16 from vertical movement on the sleeve, and permitting only rotary movement when the set screw 13 is loosened. Pivoted to one end of the member 16 is a tubular arm 18, in which is arranged a sliding bar 19, having a block 20 on its inner end, a coil spring 21 being disposed within the member 18 and surrounding the rod 19, and bearing at one end against the block 20 and with its other end against the block 22,, disposed onthe lower end of the arm 18. This block 22 is provided with a set screw 23,which is adapted to pass through the arm 18 and engage with the rod 19 to hold the same against movement. Pivoted to the outer end of the rod 19 is a pencil receiving head 24. The set screw 13' iolds the sleeve in its different vertica'l adjusted positions.

In using the device the set screw 13 is tightened so that the member 16 will rotate with the bar 10, the rod 19 being'held from longitudinal movement by means of the set screw 23, thus making it possible to use the dlevice as an ordinary compass to draw cir- 0 es.

hen it is desired to use the device for drawing ellipses orovals, I loosen the set screw 13 and slide the sleeve down toward the point 11. The set screw 13 is loosened so that the members 16 may rotate freely on the sleeve. In the block 20 I screw the pin 25 which is adapted to play longitudinally in the slot 26 formed in the lower portion of the arm 18. The screw 23 is loosened so that the spring can hold the block 20 together with the rod 19 within the arm, and be permitted to move freely when the pin 25 engages against the surface of the templet 27. The templet 27 has a square opening 28 which is adapted to he slipped on the squared portion of'a sleeve 30, the interior of said sleeve being threaded to engage with the threads 31 on the lower portion ofthe leg 10, a suitable nut 32 being adapted to be screwed on to the reduced threaded portion 33 of the sleeve 30, thus securely clamping the templet to the leg.

Vhen the arm 21 is swung around, the pin 25 will engage with the edge face of the templet 27, and the movement will be communicated to the rod 19, and cause the same to move in and out in accordance with the elevations or depressions in the templet, to produce a similar movement of the pencil in the head 24:. Thus according to the size of the templet 27, figures of various sizes may be drawn by simply turning the arm around on the sleeve 12, the pin 25 causing the rod 19 to move inwardly and outwardly.

That is claimed is:

A compass comprising a vertical leg, a sleeve slidably mounted on .the leg and flange on one end of the sleeve, the opposite end of the sleeve being threaded, a transverse member having an opening to receive said sleeve, a nut secured on to the end of the sleeve, a hollow arm pivotally connected to said member, a spring pressed rod within the pivoted arm, said arm having a longitudinal slot formed therein, a block on the inner end of the spring pressed rod, a pin projecting from the block through the slot, means for holding the rod from movement, and a templet removably secured to the lower portion of the leg, and adapted to be engaged by said pin whereby when said transverse member is rotated on the sleeve, the said rod will be moved inwardly and outwardly of the arm.

In testimony whereof I affix my signature, in the presence of two witnesses.

JOHN J. IACOVINO.

Witnesses RALPH RENzI, J OSEPI-I Groom.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

